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Geologic Hazards


Volcanoes, earthquakes, tsunamis, landslides, expansive soils and more

VolcanosVolcanos Volcanos Articles about volcanoes, volcanic hazards and eruptions past and present. Abandoned MinesAbandoned Mines Abandoned Mines accidents take 20 to 30 lives per year. Many can be prevented with education. Largest HurricanesLargest Hurricanes Largest Hurricanes Are they determined by wind speed, value of damage, most deaths? San Andreas MapSan Andreas Map Google Map of the San Andreas Fault Zoom in to see the fault trace plotted atop of a map.
Hazard InsuranceHazard Insurance Homeowner\'s Insurance and Geologic Hazards Most policies do not cover geologic hazards. Yosemite RockfallYosemite Rockfall Hazards Yosemite Rockfall Hazards have been mapped by the National Park Service. Expansive SoilsExpansive Soils Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined. LandslidesLandslides Landslides A USGS fact sheet about landslides and events that trigger them.
Naming HurricanesHurricane Names Hurricane Names How are hurricanes named? Is your name on the list? Impact CratersImpact Craters Asteroid Impact Craters! Zoom in on 50 of Earth\'s largest impact craters. LiquefactionLiquefaction Liquefaction occurs when water-saturated soil is severely shaken and loses strength. Volcanic ExplosivityVolcanic Explosivity Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
Tsunami CausesTsunami Causes What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis. Rock Fall PhotosYosemite Rock Fall Photos Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn. NovaruptaNovarupta Most Powerful Eruption of the 20th Century One hour later, the blast was heard in Juneau. Storm SurgeStorm Surge Storm Surge can be the most damaging and deadly aspect of a hurricane.
Pacific TsunamisPacific Tsunamis Pacific Tsunamis This ocean is surrounded by plate boundaries, that can produce tsunami. Atlantic TsunamisAtlantic Tsunamis Atlantic Tsunamis Rare events that can cause damage and threaten millions of people. Indian Ocean TsunamisIndian Ocean Tsunamis Indian Ocean Tsunamis Deadly tsunamis triggered by earthquakes and volcanoes.  

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